Often asked: What Is Mass Flow A Level Biology?

Mass flow, also known as “mass transfer” and “bulk flow”, is the movement of fluids down a pressure or temperature gradient, particularly in the life sciences. As such, mass flow is a subject of study in both fluid dynamics and biology.

What is the mass flow theory?

The mass flow hypothesis states that the translocation of glucose and other sugars within the phloem is caused by a never-ending flow of water and dissolved nutrients between the source (a place where sugars are made) and sink (where sugars are utilized).

Why is mass flow important biology?

Mass flow is the movement of dissolved nutrients into a plant as the plant absorbs water for transpiration. The process is responsible for most transport of nitrate, sulfate, calcium and magnesium. This is important for the transport of phosphorus and potassium.

What is mass flow in humans?

Mass flow systems work together with the specialised exchange systems (such as lungs). In humans the right side of the heart pumps blood to the lungs only and is called the pulmonary circulation, while the left side of the heart pumps blood to the rest of the body – the systemic circulation.

What is mass flow or bulk flow?

Mass flow or bulk flow is the movement down a pressure gradient ( a pressure gradient in plants is observed due to variations in solute concentration) or temperature gradient of substances in bulk or in masses. Xylem and phloem in plants play a similar role as veins and arteries in animals.

What is mass transport in biology?

Mass transport is the bulk movement of gases or liquids in direction, usually via a system of vessels and tubes. The circulatory system in mammals is a well-studied example of a mass transport system.

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How does mass flow work?

A mass flow controller automatically controls the flow rate of a gas according to a set flow rate sent as an electric signal, without being affected by use conditions or changes in gas pressure. A volumetric flow measurement is affected by ambient temperature and pressure.

Is mass flow transported by phloem?

Movement of phloem sap occurs by bulk flow (mass flow) from sugar sources to sugar sinks. The movement in phloem is bidirectional, whereas, in xylem cells, it is unidirectional (upward).

Is xylem a mass flow?

Mass transport: two delivery systems for molecules These tissues are known as xylem and phloem. In fact your browser does not support this feature. In fact your browser does not support this feature. Each of these has a bulk flow system of its own, transporting water and different solutes around the plant.

What is Munch theory?

Abstract. In the 1920s, the German forestry scientist Ernst Münch postulated that photo-assimilate transport is a mass flow driven by osmotically induced pressure gradients between source organs (high turgor) and sink organs (lower turgor).

What is bulk flow in biology?

Bulk flow is a process used by small lipid-insoluble proteins to cross the capillary wall. Capillary structure plays a large role in the rate of bulk flow, with continuous capillaries limiting flow and discontinuous capillaries facilitating the greatest amount of flow.

What is mass flow in thermodynamics?

The mass flow rate ( ) is defined as the amount of mass flowing through a cross-section per unit time. The mass flow rate of a fluid flowing in or out of a pipe or duct is proportional to the cross-sectional area (A) of the pipe or duct, the density of the fluid (ρ), and the velocity of the flow (V).

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What is mass flow phloem?

The mass flow hypothesis is a theory which attempts to explain how solutes are transported from source cells into sinks through the phloem. Solutes move down the pressure gradient towards the sink end of the phloem. Solutes move into sink cells and are converted into other molecules (e.g. starch).

Why does mass flow occur?

mass flow (pressure flow) A hypothesis to explain the movement of sugars in the phloem tissue of plants. The pressure of water in the tubes (the hydrostatic pressure) causes it to move along the tubes to a sink (site of utilization), where the reverse process occurs.

What is bulk flow in respiration?

When gases move from an area of high pressure to an area of low pressure, this is known as ‘bulk flow’. During a breathing cycle, air moves in and out of the lungs by bulk flow. The respiratory muscles are responsible for the changes in the shape and volume of the chest cavity that cause the air movements in breathing.

Which of the following moves mainly by mass flow or bulk flow in a plant body?

Water, minerals and food are generally moved by mass flow.